Control device for synchronous motor

Abstract

A control technology for a synchronous motor for suppressing rotational pulsation caused by variation in individuals without making a control algorithm complex is provided. In a motor drive system which is a control device for a synchronous motor, in order to suppress the pulsation component of N times as high as the AC frequency for driving the synchronous motor, a controller in which the phase property of the disturbance response of the controller with respect to the pulsation frequency is within ±45° is arranged. Therefore, the torque pulsation component generated from distortion in induction voltage or variation between phases is suppressed.

1. A semiconductor integrated circuit device configured so as to control a synchronous motor that is to be coupled to said semiconductor integrated circuit device through an inverter, said semiconductor integrated circuit device comprising:
 a current reproducer that reproduces phase currents of the synchronous motor from at least one of a current flowing to the synchronous motor and a current supplied to the inverter each detected by the inverter and outputted to said semiconductor integrated circuit device; and 
 a proportional-integral controller having an integral gain Ki, 
 wherein the integral gain Ki is defined as a function of ω 1 , N, and L, where the ωl is a driving electric angular frequency of the synchronous motor, the N is an arbitrary integer, and the L is an inductance of the synchronous motor, 
 wherein said semiconductor integrated circuit device adjusts a voltage output from the inverter based on the phase currents reproduced by said current reproducer, and 
 wherein the function of ω 1 , N, and L is in accordance with an equation of Ki=(ω 1 ·N) 2 ·L. 
 
     
     
       2. The semiconductor integrated circuit device according to  claim 1 ,
 wherein the N is an integer ranging from 2 to 6. 
 
     
     
       3. The semiconductor integrated circuit device according to  claim 1 ,
 wherein said proportional-integral controller has at least one of a proportional gain as a function of the electric angular frequency of AC applied to the synchronous motor and a proportional gain as a function of driving current. 
 
     
     
       4. The semiconductor integrated circuit device according to  claim 1  further comprising:
 an external connecting terminal, 
 wherein said semiconductor integrated circuit device has a function capable of freely adjusting the integral gain by at least one of directly operating said external connecting terminal and inputting a communication signal to said semiconductor integrated circuit device externally. 
 
     
     
       5. The semiconductor integrated circuit device according to  claim 1 ,
 wherein an operation processing time of said semiconductor integrated circuit device is less than or equal to 40 ps. 
 
     
     
       6. The semiconductor integrated circuit device according to  claim 1 ,
 wherein said semiconductor integrated circuit device has a phase property in which a disturbance response property of said semiconductor integrated circuit device is within approximately 45 degrees. 
 
     
     
       7. The semiconductor integrated circuit device according to  claim 6 , wherein the N is an integer ranging from 2 to 6. 
     
     
       8. The semiconductor integrated circuit device according to  claim 6 , wherein an operation processing time of said semiconductor integrated circuit device is less than equal to 40 ps. 
     
     
       9. A semiconductor integrated circuit device configured so as to control a synchronous motor that is to be coupled to said semiconductor integrated circuit device, said semiconductor integrated circuit device comprising:
 an inverter circuit unit that applies a voltage with modulated pulse width to the synchronous motor and drives the synchronous motor with an alternating current; 
 a current detector that detects at least one of a current flowing to the synchronous motor and a current supplied to said inverter circuit unit; 
 a current reproducer that reproduces phase currents of the synchronous motor from a current detected by said current detector; and 
 a proportional-integral controller having an integral gain Ki, 
 wherein the integral gain Ki is defined as a function of ω 1 , N, and L, where the ωl is a driving electric angular frequency of the synchronous motor, the N is an arbitrary integer, and the L is an inductance of the synchronous motor, 
 wherein said inverter circuit unit is adjusted in a voltage 
 output to the synchronous motor based on the phase currents reproduced by said current reproducer, and 
 wherein the function of ω 1 , N, and L is in accordance with an equation of Ki=(ω 1 ·N) 2 ·L. 
 
     
     
       10. The semiconductor integrated circuit device according to  claim 9 , wherein the N is an integer ranging from 2 to 6. 
     
     
       11. The semiconductor integrated circuit device according to  claim 9 ,
 wherein said proportional-integral controller has at least one of a proportional gain as a function of the electric angular frequency of AC applied to the synchronous motor and a proportional gain as a function of a driving current. 
 
     
     
       12. The semiconductor integrated circuit device according to  claim 9 , further comprising:
 an external connecting terminal, 
 wherein said semiconductor integrated circuit device has function capable of freely adjusting the integral gain by at least one of directly operating said external connecting terminal and inputting a communication signal to said semiconductor integrated circuit device externally. 
 
     
     
       13. The semiconductor integrated circuit device according to  claim 9 ,
 wherein an operation processing time of said semiconductor integrated circuit device is less than or equal to 40 ps. 
 
     
     
       14. The semiconductor integrated circuit device according to  claim 9 ,
 wherein said semiconductor integrated circuit device has a phase property in which a disturbance response property of said semiconductor integrated circuit device is within approximately 45 degrees. 
 
     
     
       15. The semiconductor integrated circuit device according to  claim 14 ,
 wherein the N is an integer ranging from 2 to 6. 
 
     
     
       16. The semiconductor integrated circuit device according to  claim 14 ,
 wherein an operation processing time of said semiconductor integrated circuit device is less than or equal to 40 ps.